Be sure to the radio before you leave．( )A．try outB．fall awayC．turn offD．agree with 题目和参考答案——青夏教育精英家教网—

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4．Be sure to __________ the radio before you leave．（　　）

A．

try out

B．

fall away

C．

turn off

D．

agree with

分析你离开之前务必要关掉收音机．

解答答案：C．be sure to do sth 务必做某事．跳过空格推知句意是表达离开之前务必要关掉收音机．turn off关掉，try out 实验，fall away离开，agree with赞同，故答案是C．

点评 be sure to do sth：其主语既可以是人称主语，也可以是非人称主语．译为"肯定"、"一定"、"谅必"、"势必"等等．
例如：
Tom is sure to help her．汤姆肯定会帮她的．

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